The X-axis is the one on the bottom if you are in the first quadrant. The y-axis is on the left or up and down. If you are writing location(I can't remember the name but it looks like this (2,3)) you would write the X-axis down first. Hope this helped!
In mathematics , a rational number is a number that can be expressed as the quotient or fraction of two integers, a numerator and a non zero denominator.